Vacuum forming device for casting vermicular graphite iron piece through V method

Abstract

The invention relates to the technical field of V-method casting, in particular to a vacuum forming device for V-method casting of vermicular graphite iron parts, which comprises a mold and a sand box, the bottom of the sand box is matched with the upper end of the mold, and a covering film is arranged between the mold and the sand box; the sealing assembly comprises an air blocking block arranged at the upper end of the mold, and vacuumizing cannot be continued when the air blocking block reaches a preset position; the compaction assembly is mounted in the sand box in a sliding manner and is matched with the upper end of the mold; according to the vacuum forming device for casting the vermicular graphite iron piece through the V method, the problems that a film layer is likely to be subjected to the strong suction effect in the vacuumizing process, the film layer is sucked into a hole, the film layer is wrinkled in the process, and the appearance defect and size deviation of the casting are caused after the casting is completed can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of V-method casting, in particular to a vacuum forming device for V-method casting of vermicular graphite iron parts. Background Art

[0002] V-method casting is also called negative pressure casting or vacuum casting. It uses vacuum pressure to cover the heated plastic film on the pattern or template, fills the box with dry sand without adhesive, and then seals the top surface of the sand mold with a plastic film, evacuates the sand mold, makes the sand mold compact, demolds, cores, closes the mold, and pours until solidification; if the vacuum is too high during the vacuum process, the film layer may be subjected to strong suction during the vacuum process, causing the film layer to be sucked into the hole. After the film layer is sucked into the hole, it may cause concave or convex marks on the surface of the casting, affecting the appearance quality of the casting, reducing the density of the casting, thereby affecting the strength and performance of the casting and reducing the dimensional accuracy. At the same time, the film layer will wrinkle during the vacuum process, which will cause the mold surface to be uneven. If the film layer wrinkles severely, this will affect the dimensional accuracy and surface quality of the casting, and may cause the adhesion between the film layer and the mold surface to weaken, or even peel off or break. In addition, the wrinkling of the film layer will cause uneven marks on the surface of the casting, affecting the appearance quality of the casting. Summary of the invention

[0003] The present invention provides a vacuum forming device for V-method casting of vermicular graphite iron parts, which can prevent a film layer from being subjected to a strong suction force during vacuuming, thereby causing the film layer to be sucked into a hole and wrinkled.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A vacuum forming device for V-method casting of vermicular iron parts, comprising: a mold and a sand box, wherein the bottom of the sand box cooperates with the upper end of the mold, and a coating is provided between the mold and the sand box; a closing component, wherein the closing component comprises an air blocking block disposed at the upper end of the mold, and the air blocking block cannot continue to be vacuumed when it reaches a preset position; and a compacting component, wherein the compacting component is slidably mounted inside the sand box and cooperates with the upper end of the mold.

[0006] Preferably, the sealing component also includes a telescopic spring arranged below the air blocking block, an exhaust pipe is arranged through the upper end of the mold, the exhaust pipe is communicated with the exhaust port arranged on the side of the mold, the telescopic spring is placed in the exhaust pipe, when the telescopic spring is extended in a non-vacuumed state, the air blocking block is away from the exhaust pipe, when the exhaust port starts to vacuum, the coating is deformed by the suction force and fits the surface of the mold, and the air blocking block is pressed down to compress the telescopic spring to block the exhaust pipe and stop vacuuming.

[0007] Preferably, the compaction assembly includes a pressing mold, which is slidably matched with the inner wall of the sand box. A telescopic rod is connected to the upper end of the pressing mold, and the upper end of the telescopic rod is connected to the upper end of the sand box. When the mold is drawn, the coating is deformed by suction and fits the surface of the mold, and at the same time, the pressing mold fits the upper surface of the coating.

[0008] Preferably, a sand storage bin is provided on the side of the sand box, a sand bin door is provided on the outer side of the sand storage bin, a lower sand stop door is installed on the inner side wall of the sand box, a downward pressure spring is provided on the upper end of the lower sand stop door, the lower sand stop door cooperates with the sand storage bin and contacts with the downward pressure mold, when the downward pressure mold rises, it drives the lower sand stop door to rise, and the rising of the lower sand stop door will make the sand storage bin communicate with the inside of the sand box, and when the downward pressure mold descends, the lower sand stop door is affected by its own weight and the downward pressure spring to block the sand storage bin and the sand box space, and stop sand from being lowered.

[0009] Preferably, a shock bin is provided at the upper end of the pressing mold, a sand-shaking hammer is provided inside the shock bin, and a shock motor is provided at the upper end of the shock bin, and the shock motor is connected to the sand-shaking hammer.

[0010] Preferably, a sand box vacuum port is provided through the side of the sand box, the sand box vacuum port is provided with sand-proof air holes, and a sand-blocking sticky net is provided outside the sand-proof air holes.

[0011] Preferably, a heating port is provided on the side of the sand box, a cover plate is provided inside the heating port, and the heating port can heat the coating.

[0012] Preferably, the sand box further comprises a rotating column arranged on the side, the sand box is mounted on a support frame via the rotating column, a rotating motor is arranged on the outside of the support frame, and the rotating motor is transmission-connected to the rotating column.

[0013] Preferably, when pouring the coating forming model, a vermicular iron is used for pouring. The reason for using the vermicular iron is that it has high strength and good toughness, good wear resistance and heat resistance.

[0014] The present invention provides a vacuum forming device for V-method casting of vermicular graphite iron parts, which can make the film layer be subjected to strong suction during the vacuuming process, causing the film layer to be sucked into the hole and the film layer to wrinkle during the process, so as to avoid defects in the appearance and dimensional deviation of the casting after the casting is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a vacuum forming device for V-method casting of vermicular graphite iron parts of the present invention;

[0016] Figure 2 It is a structural schematic diagram of the sand box of the present invention;

[0017] Figure 3 It is a schematic diagram of the cross-sectional structure of the sand box of the present invention;

[0018] Figure 4 It is a structural schematic diagram of the vacuum port of the sand box of the present invention;

[0019] Figure 5 It is a structural schematic diagram of the mold and the pressing mold of the present invention;

[0020] Figure 6 It is a structural schematic diagram of the mold of the present invention;

[0021] Figure 7 It is a structural schematic diagram of the mold section of the present invention;

[0022] Figure 8 It is a schematic diagram of the state structure of the vacuum forming device for casting vermicular graphite iron parts by the V method of the present invention.

[0023] In the figure: 1. mold; 2. sand box; 3. sand storage bin; 4. sand bin door; 5. sand box vacuum port; 6. sand lowering door; 7. downward pressure spring; 8. laminating; 9. downward pressure mold; 12. sand shaking hammer; 13. telescopic rod; 14. exhaust pipe; 15. sand blocking net; 16. sand prevention air hole; 18. oscillation motor; 19. heating port; cover plate; 22. rotating column; 23. exhaust port; 24. air blocking block; 25. telescopic spring; 26. oscillation bin; 27. rotating motor. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figures 1 to 8The present invention provides a technical solution: a vacuum forming device for V-method casting of vermicular iron parts, comprising: a mold 1 and a sand box 2, the bottom of the sand box 2 cooperates with the upper end of the mold 1, and a coating 8 is arranged between the mold 1 and the sand box 2; a closing component, the closing component comprises an air blocking block 24 disposed at the upper end of the mold 1, and the air blocking block 24 cannot continue to be vacuumed when it reaches a preset position; a compacting component, the compacting component is slidably mounted inside the sand box 2 and cooperates with the upper end of the mold 1; if the vacuum is too high during the vacuuming process, the film layer may be subjected to a strong suction force during the vacuuming process, causing the film layer to be sucked into the hole, and after the film layer is sucked into the hole, it may cause depressions or protrusions on the surface of the casting The traces of the film 8 affect the appearance quality of the casting, reduce the density of the casting, and thus affect the strength, performance and dimensional accuracy of the casting. When the mold 1 is pressed down during the coating 8, the mold 1 starts to evacuate the air. When the coating 8 is completely in contact with the air blocking block 24 on the mold 1, the pressure of the film and the suction of the vacuum block block 24 block the vacuum port. At the same time, the compacting component is also descending while the film is descending and fits with the outer wall of the film. It can apply pressure to the air blocking block 24 while preventing the coating 8 from wrinkling due to uneven force. When the coating 8 forms the shape of the mold, the compacting component rises to add sand into the sand box 2, and then the compacting component is lowered again to compact the sand and remove the vacuum inside the sand box 2 to complete the mold forming.

[0026] Specifically, the sealing component also includes a telescopic spring 25 arranged under the air blocking block 24. An air extraction pipe 14 is penetrated at the upper end of the mold 1. The air extraction pipe 14 is communicated with an air extraction port 23 arranged on the side of the mold 1. The telescopic spring 25 is placed in the air extraction pipe 14. When the telescopic spring 25 is extended in the non-vacuumed state, the air blocking block 24 is away from the air extraction pipe 14. When the air extraction port 23 starts to evacuate, the coating 8 is deformed by the suction force and fits the surface of the mold 1. The air blocking block 24 is pressed down to compress the telescopic spring 25 to block the air extraction pipe 14 and stop evacuating. The sealing component is provided with a plurality of springs distributed on the upper surface of the mold 1. When the air is evacuated, When the port 23 is opened and the vacuum is started, the coating 8 is heated and comes into contact with the mold 1, and the air between the coating 8 and the mold 1 is extracted from the exhaust port 23. When the coating 8 is completely in contact with the outer surface of the mold 1, the air blocking block 24 will be affected by the pressure of the coating 8 and the suction of the vacuum, so that the air blocking block 24 and the exhaust pipe 14 are completely fitted and blocked, forming a closure to the vacuum. At this time, the vacuum can be prevented from being too high. The film layer may be subjected to strong suction during the vacuum process, which may cause the film layer to be sucked away, resulting in the coating 8 having a dent after molding, which affects the appearance quality of the casting and reduces the density of the casting.

[0027] Furthermore, the compaction assembly includes a pressing mold 9, which is slidably matched with the inner wall of the sand box 2. The upper end of the pressing mold 9 is connected to a telescopic rod 13, and the upper end of the telescopic rod 13 is connected to the upper end of the sand box 2. When the mold 1 is evacuated, the film 8 is deformed by the suction force and fits the surface of the mold 1. At the same time, the pressing mold 9 is pressed down to fit the upper surface of the film 8. When the air between the film 8 and the mold 1 is sucked away from the exhaust port 23, the telescopic rod 13 drives the pressing mold 9 to descend, and the inner wall of the pressing mold 9 is in contact with the outer shape of the mold 1. The same, but the size is larger than the mold 1, and the larger size is just the thickness of the film 8. Therefore, when the film 8 is fitted with the mold 1, the pressing mold 9 is also fitted with the outer surface of the film 8. The fitted auxiliary film 8 completely compacts the air blocking block 24 and flattens the wrinkles formed in the vacuuming process of the film 8. Because the film has been heated, when the pressing mold 9 and the mold 1 are fitted with the film 8 at the same time, the flatness of the inside and outside of the film 8 can be guaranteed as long as the lower surface of the pressing mold 9 and the upper surface of the mold 1 are made flat.

[0028] Furthermore, a sand storage bin 3 is provided on the side of the sand box 2, a sand bin door 4 is provided on the outer side of the sand storage bin 3, a lower sand stop door 6 is installed on the inner wall of the sand box 2, and a downward pressure spring 7 is provided on the upper end of the lower sand stop door 6. The lower sand stop door 6 cooperates with the sand storage bin 3 and contacts with the downward pressure mold 9. When the downward pressure mold 9 rises, it drives the lower sand stop door 6 to rise. The rising of the lower sand stop door 6 will make the sand storage bin 3 communicate with the inside of the sand box 2. When the downward pressure mold 9 descends, the lower sand stop door 6 is blocked by its own weight and the downward pressure spring 7 to stop the sand from being dropped between the sand storage bin 3 and the sand box 2; adding sand to casting is one of the important links in the casting production process. The importance of adding sand in the V-method casting process is very significant. Achieving the goal of high efficiency, low labor and high quality is what foundries have always pursued. At present, due to various factors, it is difficult to unify the sizes of various sand boxes in the casting sand adding project. Affected by the size of the sand box 2, the sand adding process has high labor intensity, low work efficiency, unstable sand adding and other technical problems. In the face of this problem, automatic sand adding is adopted to reduce the manual workload to achieve high efficiency and high quality. After the pressing mold 9 is pressed down to complete the forming of the film 8, the pressing mold 9 is driven to rise by the rising of the telescopic rod 13. In the process of rising, it contacts the lower sand gate 6 and drives the lower sand gate 6 to rise. When the lower sand gate rises, the processed sand inside the sand storage bin 3 will enter under the influence of its own gravity, enter the sand box 2 and press on the already formed film 8. The bottom of the sand storage bin 3 is set as an inclined surface, so the sand inside will all fall into the sand box 2. At this time, the mold 9 is driven to fall by the decline of the telescopic rod 13. The lower sand gate 6 is blocked by its own weight and the downward spring 7 to stop the sand from falling, and the sand is released.

[0029] Specifically, an oscillation bin 26 is provided at the upper end of the pressing mold 9, a sand-vibrating hammer 12 is provided inside the oscillation bin 26, an oscillation motor 18 is provided at the upper end of the oscillation bin 26, and the oscillation motor 18 is connected to the sand-vibrating hammer 12; the existing sand-adding process is to add sand while vibrating slightly to ensure that the sand box is filled with dry sand, but this process is inefficient and time-consuming and labor-intensive. The present invention adopts an automatic sand-adding method and a vibration-compacting method. After the sand is placed inside the sand box 2, the telescopic rod 13 descends, and the oscillation motor 18 at the upper end of the pressing mold 9 is turned on to vibrate the sand inside the sand box 2. Because the middle part of the pressing mold 9 is concave, the sand will be gathered toward the center by the force, and the pressing mold 9 is pressed down to the preset position to complete the first step of the compacting process.

[0030] Furthermore, after the first step of compaction of the sand in the sand box 2 is completed, the vacuum port 5 on the side of the sand box 2 is opened to start vacuuming, and the air inside will be sucked away. At the same time, when the air is sucked away, the downward pressure mold 9 and the piston formed inside the sand box 2 are pressed down by pressure to perform secondary compaction on the sand inside the sand box 2 to complete the entire compaction process. The sand box 2 is provided with a sand box vacuum port 5 on the side, and the sand box vacuum port 5 is provided with a sand-proof pore 16, and a sand-blocking net 15 is provided on the outside of the sand-proof pore 16; when the sand box is vacuumed, part of the sand may be sucked away. This is because the purpose of vacuuming the sand box is to remove the gas and air pores in the sand box by reducing the gas pressure, thereby improving the density and surface quality of the casting. In the process of vacuuming the sand box, the vacuum pump will reduce the air pressure in the sand box by extracting gas, thereby causing the gas and air pores in the sand box to be extracted. In this process, some sand may be taken away, but usually only in small amounts. In order to reduce the sand being sucked away, the following measures can be taken: when the vacuum port 5 on the side of the sand box 2 is opened and vacuuming begins, the sand-proof air holes 16 will simply block the sand from entering. When fine sand enters through the sand-proof air holes 16, it will be adhered to the sand-blocking sticky net 15, so that the sand will adhere to the surface of the sand-blocking sticky net 15, and it only needs to be cleaned on time.

[0031] Specifically, a heating port 19 is provided on the side of the sand box 2, and a cover plate 21 is provided inside the heating port 19. The heating port 19 can heat the coating 8. The existing heating method for the coating 8 adopts professional heating to heat the coating separately before placing it into the sand box. This method will cause the heating machine to heat quickly in an open space. This method will cause the loss of heat energy and the waste of energy. In order to avoid the loss of heat energy and the increase of processes, the heating port 19 is provided on the side of the sand box 2. Only the cover plate 21 needs to be opened to place the heating machine. In this way, the heat will be retained to the greatest extent in the closed space, reducing the waste of energy.

[0032] More specifically, the sand box 2 also includes a rotating column 22 arranged on the side, and the sand box 2 is installed on the support frame 28 through the rotating column 22. A rotating motor 27 is arranged on the outside of the support frame 28, and the rotating motor 27 is connected to the rotating column 22 in transmission. After the existing sand box is formed, it is necessary to manually take out the sand box through a machine and perform a flipping operation. This operation may cause the risk of injury to the staff, so the sand box 2 and the flipping machine are integrated. When flipping is required, the rotating motor 27 on the side of the support frame 28 is turned on, and the rotating motor 27 drives the rotating column 22 on the side of the sand box 2 to rotate, so that the sand box is flipped, which increases efficiency while reducing the risk of personal injury.

[0033] Preferably, when the coating 8 forms a model for pouring, vermicular iron is used for pouring. The advantages of using vermicular iron are: vermicular iron has good heat resistance: vermicular iron can maintain good mechanical properties and stability under high temperature environment. This makes them suitable for applications under high temperature working conditions, such as automobile engine parts, boiler pipes, etc.; vermicular iron has excellent corrosion resistance: vermicular iron has excellent corrosion resistance in acidic, alkaline and high temperature environments, which makes them suitable for applications in corrosive environments such as chemical industry and petrochemical industry; vermicular iron has good mechanical properties: vermicular iron has high strength and toughness, and can withstand large loads and impacts. This makes them suitable for engineering applications that require high strength and durability; vermicular iron has good processing properties: vermicular iron can be processed and manufactured by various processing methods, such as casting, forging, machining, etc. This makes them have high flexibility and plasticity in the production process. 4. Vermicular iron has a lower cost: Compared with other high-temperature alloy materials, vermicular iron has a lower cost. This makes them an economical and practical choice that can reduce production costs.

[0034] Working principle: When the vacuum forming device for V-method casting of vermicular graphite iron parts is used, the film 8 is lowered to fit the mold, and when the air suction port 23 is opened to start vacuuming, the film 8 is heated and lowered to contact the mold 1, and the air between the film 8 and the mold 1 is sucked away from the air suction port 23. When the film 8 is completely in contact with the outer surface of the mold 1, the air blocking block 24 will be reduced by the pressure of the lowering film 8 and the suction force of the vacuum, so that the air blocking block 24 is completely fitted and blocked with the air suction pipe 14. At the same time, the telescopic rod 13 drives the pressing mold 9 to descend, and the pressing mold 9 is also fitted with the outer surface of the film 8. The well-fitted auxiliary film 8 completely compacts the air blocking block 24, and at the same time flattens the wrinkles formed on the film 8 during the vacuuming process. After the pressing mold 9 is pressed down to complete the forming of the film 8, the pressing mold 9 is driven to rise by the rise of the telescopic rod 13. The lower sand stop door 6 contacts and drives the lower sand stop door 6 to rise. After the lower sand stop door rises, the processed sand inside the sand storage bin 3 will enter under the influence of its own gravity, enter the sand box 2 and be pressed on the already formed coating 8. At this time, the mold 9 is driven down by the descent of the telescopic rod 13. The lower sand stop door 6 is blocked by its own weight and the downward pressure spring 7 to stop the sand from being lowered and complete the sand release. When the sand is released inside the sand box 2, the telescopic rod 13 descends, and the oscillation motor 18 at the upper end of the downward pressure mold 9 is turned on to vibrate the sand inside the sand box 2. Because the middle part of the downward pressure mold 9 is concave, the sand will be gathered toward the center under the force. When the downward pressure mold 9 is pressed down to the preset position to complete the first step of compaction process, when the first step of compaction of the sand in the sand box 2 is completed, the vacuum port 5 on the side of the sand box 2 is opened to start vacuuming, and the air inside will be sucked away at this time. At the same time, when the air is sucked away, the piston formed inside the downward pressing mold 9 and the sand box 2 is pressed downward by pressure to compact the sand inside the sand box 2 for the second time to complete the entire compaction process. The vacuum port 5 on the side of the sand box 2 is opened to start vacuuming, and the sand-proof air holes 16 will simply block the sand from entering. When fine sand enters through the sand-proof air holes 16, it will be adhered by the sand-blocking sticky net 15 with adhesion, so that the sand will adhere to the surface of the sand-blocking sticky net 15, which only needs to be cleaned on time; when the sand box 2 is vacuumed, the supporting rotating motor 27 is turned on when it needs to be turned over, and the rotating motor 27 drives the rotating column 22 to rotate, so that the sand box is turned over.

[0035] The present invention utilizes the above structure to make the film layer be subjected to strong suction during the vacuum process, causing the film layer to be sucked into the hole and wrinkled during the process, resulting in defects in the appearance and dimensional deviation of the casting after the casting is completed.

[0036] The standard parts used in this embodiment can be purchased directly from the market, and the non-standard structural components recorded in the specification and the drawings can also be directly processed according to the existing technical common sense. At the same time, the connection method of each component adopts the mature conventional means in the prior art, and the machinery, parts and equipment all adopt the conventional models in the prior art, so no specific description will be given here.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A vacuum forming device for V-method casting of vermicular graphite iron parts, characterized in that: include: A mold (1) and a sand box (2), wherein the bottom of the sand box (2) matches the upper end of the mold (1), and a coating (8) is provided between the mold (1) and the sand box (2); A sealing component, the sealing component comprising a gas blocking block (24) disposed at the upper end of the mold (1), wherein the gas blocking block (24) cannot continue to draw a vacuum when it reaches a preset position; A compacting assembly is slidably mounted inside the sand box (2) and cooperates with the upper end of the mold (1).

2. The vacuum forming device for V-method casting of compacted graphite iron parts according to claim 1, characterized in that: The sealing component also includes a telescopic spring (25) arranged below the air blocking block (24); an exhaust pipe (14) is provided through the upper end of the mold (1); the exhaust pipe (14) is communicated with an exhaust port (23) provided on the side of the mold (1); the telescopic spring (25) is placed in the exhaust pipe (14); when the telescopic spring (25) is extended in a non-vacuumed state, the air blocking block (24) is away from the exhaust pipe (14); when the exhaust port (23) starts to evacuate, the coating (8) is deformed by suction and adheres to the surface of the mold (1); and when the air blocking block (24) is pressed downward, the telescopic spring (25) is compressed to block the exhaust pipe (14) and stop evacuating.

3. The vacuum forming device for V-method casting of compacted graphite iron parts according to claim 2, characterized in that: The compaction assembly comprises a pressing mold (9), the pressing mold (9) is slidably matched with the inner wall of the sand box (2), the upper end of the pressing mold (9) is connected to a telescopic rod (13), the upper end of the telescopic rod (13) is connected to the upper end of the sand box (2), when the mold (1) is evacuated, the coating (8) is deformed by the suction force and fits with the surface of the mold (1), and at the same time, the pressing mold (9) is pressed downward to fit with the upper surface of the coating (8).

4. The vacuum forming device for V-method casting of vermicular graphite iron parts according to claim 3, characterized in that: A sand storage bin (3) is arranged on the side of the sand box (2), a sand bin door (4) is arranged on the outer side of the sand storage bin (3), a lower sand stop door (6) is installed on the inner side wall of the sand box (2), a downward pressure spring (7) is arranged on the upper end of the lower sand stop door (6), the lower sand stop door (6) cooperates with the sand storage bin (3) and contacts with the downward pressure mold (9), when the downward pressure mold (9) rises, the lower sand stop door (6) is driven to rise, and the rising of the lower sand stop door (6) makes the sand storage bin (3) communicate with the inside of the sand box (2), when the downward pressure mold (9) descends, the lower sand stop door (6) is subjected to its own weight and the downward pressure spring (7) to block the space between the sand storage bin (3) and the sand box (2) and stop sand from falling.

5. The vacuum forming device for V-method casting of compacted graphite iron parts according to claim 4, characterized in that: The upper end of the pressing mold (9) is provided with a vibration chamber (26), a sand vibrating hammer (12) is provided inside the vibration chamber (26), and an vibration motor (18) is provided at the upper end of the vibration chamber (26), and the vibration motor (18) is connected to the sand vibrating hammer (12).

6. The vacuum forming device for V-method casting of vermicular graphite iron parts according to claim 5, characterized in that: A sand box vacuum port (5) is provided through the side of the sand box (2), the sand box vacuum port (5) is provided with a sand-proof air hole (16), and a sand-blocking sticky net (15) is provided outside the sand-proof air hole (16).

7. The vacuum forming device for V-casting vermicular iron parts according to claim 6, characterized in that: A heating port (19) is arranged on the side of the sand box (2), a cover plate (21) is arranged inside the heating port (19), and the heating port (19) can heat the coating (8).

8. The vacuum forming device for V-casting vermicular iron parts according to claim 7, characterized in that: The sand box (2) further comprises a rotating column (22) arranged on the side, and the sand box (2) is installed on a support frame (28) through the rotating column (22). A rotating motor (27) is arranged on the outside of the support frame (28), and the rotating motor (27) is transmission-connected to the rotating column (22).

9. The vacuum forming device for V-casting compacted graphite iron parts according to any one of claims 1 to 5, characterized in that: When the coating (8) is cast into a model, a vermicular iron piece is used for casting. The reason for using the vermicular iron piece is that it has high strength and good toughness, good wear resistance and heat resistance.

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